63 Dart overheating issue

So, final update.

It appears the overheating problem is solved. It was definitely the rad. Once it was flushed it ran extremely cool. Now it doesn't really get to operating range without the thermostat. I am still getting some debris coming through so I have flushed it out a few more times. Water is finally almost clear after a run or two. One or two more times and I can pull the rad one final time for a good cleanout and reinstall with thermostat and fresh clean coolant and I'll be good to go.

Will be doing it soon as in a few more weeks temps will start to get closer to freezing than I would like running pure water. Only takes one cold snap to mess things up. Don't want to go there.

Super glad it was an easy resolution. Too bad my heat soak issue is still there. Not as bad but not gone.